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        /*
            clone()  用于节点的克隆，如果传入true，会把被克隆的节点以及所有子节点的事件也克隆了
                        如果传入true,false两个，则会把被克隆节点本身的事件克隆，子节点不会
                        不要妄想false,true这种，不可能的
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        $('#box').clone(true).insertAfter($('hr'))
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